Hi Sharan, 

This issue may be happened due to the oracle client version. If the crystal web server has older Oracle client version ( less than 12), try the below and check whether the issue is resolved or not.

• Please uninstall the current oracle client version installed in the crystal server and re-install the oracle 12 64 bit client.
• Remove the comment in the following line of machine.config file. 
   <healthMonitoring>
        <providers>
          <add name="OracleWebEventProvider" type="Oracle.Web.Management.OracleWebEventProvider, Oracle.Web, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" connectionStringName="OraAspNetConString" buffer="true" bufferMode="OracleNotification" />
        </providers>
      </healthMonitoring> 
• Reinstalled the CWS and configure.

Best Regards,

Kapilan

You may see this issue if crystal couldn't generate the pdf as well. So need to check what is the reason for failure.

Do you see this issue for all your crystal reports including crystal quick reports and info service reports?

Do you have a CR_Web_Log.exe file in your crystal configuration folder? if it is there, please try enabling and see what errors you get there.

This is only included in later versions so if you don't have that, you will need to create a support case and get assistance if none of the above helps you.

This can be for many reasons,

1. The prerequisites are not properly installed (check video)
2.  The tnsname in the config xml in the Crystal Web Service is not added or matching the name in the tnsnames.ora file or pointing to a wrong database
3. The passwords in the config xml are wrong
4. The bit rate of Oracle and the Crystal .net runtime are different (need to be same) or you have installed both versions of the .net runtime (should have only one)
5. Oracle Client Runtime is not installed
6. If this is happening only for one report then it can be an issue with the report itself
7. Java is not installed or not mentioned in the system path

/Chanaka

Thanks Chanaka, Rusuru, and Kapilan.

It Worked for me.

/Shitanshu